package javacore.net.javacore;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Scanner;

/**
 * This program implements a simple server that listens to port 8189 and echoes back all client
 * input.
 * 
 * @version 1.20 2004-08-03
 * @author Cay Horstmann
 */
public class EchoServer
{
    public static void main(String[] args)
    {
        try
        {
            // establish server socket
            ServerSocket s = new ServerSocket(8189);

            // wait for client connection
            Socket incoming = s.accept();
            try
            {
                InputStream inStream = incoming.getInputStream();
                OutputStream outStream = incoming.getOutputStream();

                Scanner in = new Scanner(inStream);
                PrintWriter out = new PrintWriter(outStream, true /* autoFlush */);

                out.println("Hello! Enter bye to exit.");

                // echo client input
                boolean done = false;
                while (!done && in.hasNextLine())
                {
                    String line = in.nextLine();
                    out.println("Echo: " + line);
                    if (line.trim().equals("bye"))
                    {
                        done = true;
                    }
                }
            }
            finally
            {
                incoming.close();
            }
        }
        catch (IOException e)
        {
            e.printStackTrace();
        }
    }
}
